Host device, a point of deployment (POD), and a method of identifying an operation mode

ABSTRACT

A host device, POD (point of deployment) and a method of identifying an operation mode are disclosed, by which data received via internet can be processed. The present invention includes an interface unit including CD#1, CD#2, VS1#, VS2#, VPP1, VPP2 and IPDET ports and a controller controlling a mode confirmation signal to be outputted to the POD via the IPDET port, the controller recognizing that the POD supports an IP (internet protocol) card M-mode if the outputted mode confirmation signal is inputted to the VS1# port.

This application claims the benefit of the U.S. Provisional Application No. 60/952,841, filed on Jul. 30, 2007, which is hereby incorporated by reference as if fully set forth herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a host device, POD (point of deployment) and a method of identifying an operation mode. Although the present invention is suitable for a wide scope of applications, it is particularly suitable for using Internet.

2. Discussion of the Related Art

Existing television (TV) services have been provided in such a manner that contents produced by broadcasting companies are transmitted through radio transmission media, such as terrestrial waves, cables or satellites, and a viewer watches the transmitted contents through a TV receiver capable of receiving the transmitted contents via the respective transmission media.

However, as digital TV technologies based on digital broadcasting are developed and are commercially available, breaking from existing analog broadcasting, various contents, such as real-time broadcasts, Contents on Demand (CoD), games and news, can be provided to a viewer using the Internet network connected to each home, besides the existing transmission media.

An example of the provision of contents using the Internet network may include an Internet Protocol TV (IPTV). The IPTV indicates a broadcast receiver for receiving various types of information services, moving-image contents and broadcasts using an Internet network and displaying them to a user. The Internet network can be implemented on the basis of various types of networks such as optical cable networks, coaxial cable networks, fiber-to-the-home (FTTH), telephone networks and wireless networks.

The service using the Internet network additionally has bidirectionality and enables a viewer to watch a desired program at his/her convenient time, unlike general terrestrial broadcasting.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a host device, POD (point of deployment) and a method of identifying an operation mode that substantially obviate one or more problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a host device, POD (point of deployment) and a method of identifying an operation mode, by which data received via internet can be processed.

Another object of the present invention is to provide a host device, POD (point of deployment) and a method of identifying an operation mode, by which a mode of POD capable of processing data received via internet can be determined.

Another object of the present invention is to provide a host device, POD (point of deployment) and a method of identifying an operation mode, by which an M-Mode of POD capable of processing data received via internet can be determined.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a host device, which interfaces with a POD (point of deployment), according to the present invention includes an interface unit including CD#1, CD#2, VS1#, VS2#, VPP1, VPP2 and IPDET ports, and a controller controlling a mode confirmation signal to be outputted to the POD via the IPDET port and recognizing that the POD supports an IP (internet protocol) card M-mode if the outputted mode confirmation signal is inputted to the VS1# port.

Also, if recognizing that the POD supports the IP card M-mode, the controller may set the VPP1 port and the VPP2 port to ‘logic low’ and ‘logic low’, respectively.

Also, the controller may check whether the POD is inserted by detecting states of the CD1# and CD#2 ports.

Also, after checking that the POD is inserted, the controller may control the mode confirmation signal to be outputted.

Also, the controller may control the mode confirmation signal to be outputted by toggling the IPDET port.

In another aspect of the present invention, a POD (point of deployment), which interfaces with a host device, includes an interface unit including CD#1, CD#2, VS1#, VS2#, VPP1, VPP2 and IPDET pins and enabling a signal inputted via the IPDET pin to be outputted to the VS1# pin, and a controller checking whether the host device supports an IP (internet protocol) card M-mode by detecting states of the VPP1 and VPP2 pins and performing initialization according to whether the host device supports the IP (internet protocol) card M-mode.

Also if the VPP1 pin and the VPP2 pin are set to ‘logic low’ and ‘logic low’, respectively, the controller may confirm that the host device supports the IP (internet protocol) card M-mode.

Also if the POD is inserted in the host device, both of the CD1# and CD2# pins may be in low states, respectively.

In another aspect of the present invention, a method of identifying an operation mode, includes the steps of: checking whether a POD (point of deployment) is inserted; outputting a mode confirmation signal to the POD via an IPDET port when the POD (point of deployment) is inserted; checking whether the outputted mode confirmation signal is inputted to either a VS1# port or a VS2# port; and recognizing that the POD supports an IP (internet protocol) card M-mode when the outputted mode confirmation signal is inputted to the VS1# port.

Also the method of claim further comprises setting a VPP1 port and a VPP2 port to ‘logic low’ and ‘logic low’, respectively when the POD is recognized as supporting the IP card M-mode.

Also in the POD insertion checking step, whether the POD (point of deployment) is inserted is checked by detecting states of CD1# and CD2# ports.

Also in the mode confirmation signal outputting step, the mode confirmation signal is outputted by toggling the IPDET port.

Therefore, by a host device, POD (point of deployment) and a method of identifying an operation mode according to the present invention, a mode of POD capable of processing data received via internet can be efficiently determined.

And, a mode of a POD (point of deployment) capable of processing data received via internet can be determined by maintaining compatibility with conventional CableCard.

Moreover, not only S-Mode and M-Mode of conventional CableCard but also an M-Mode of a POD (point of deployment) capable of processing data received via internet is determined without allocating a separately designated pin.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:

FIG. 1 is a schematic diagram of an IPTV system according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a receiver using a security CARD 220 according to one embodiment of the present invention;

FIG. 3 is a configurational diagram of a broadcast receiver connected to an external network using DOCSIS modem according to the present invention;

FIG. 4 is a structural diagram of an Ethernet frame according to one embodiment of the present invention;

FIG. 5A and FIG. 5B are tables for operating modes mapped according to a combination between security CARD and host device, respectively;

FIG. 6A and FIG. 6B are tables for card interface pin assignment of cards using PC card form, respectively;

FIG. 7 is a diagram of an interface between a host device and a security CARD;

FIG. 8 is a table for a signal supplied to a security CARD to inform the security CARD of an operation mode identified by a host device;

FIG. 9 is a diagram for performing a method of identifying an operation mode according to one embodiment of the present invention; and

FIG. 10 is a diagram for performing a method of identifying an operation mode according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In addition, although the terms used in the present invention are selected from generally known and used terms, some of the terms mentioned in the description of the present invention have been selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meanings of each term lying within.

A broadcast receiver and a method of processing broadcast data according to the present invention will be described in detail with reference to the accompanying drawings.

An Internet protocol TV (IPTV) system which is an example of a system capable of providing various types of contents using an Internet network may be largely divided into a server, a network and a broadcast receiver (client).

The server of the IPTV system may include servers having various functions, such as a service discovery and selection server, a streaming server, a content guide information server, a customer information server, and a payment information server.

Among these servers, the streaming server transmits stored Moving Picture Experts Group (MPEG)-2 or MPEG-4 encoding moving-image data to the broadcast receiver via a network. As a transmission protocol, a real-time transport protocol (RTP) or a RTP control protocol (RTCP) may be used.

In the case where a real-time streaming protocol (RTSP) is used, the reproduction of a moving-image stream can be controlled by a network trick play function such as Pause, Replay, Stop or the like to some extent.

The content guide information server provides information on provided various contents. The content guide information includes a variety of information on the contents as information corresponding to electronic program guide (EPG) information. The content guide information server stores content guide information data and provides the stored data to the broadcast receiver.

Among the servers, the service discovery and selection server provides access information of servers for providing various types of content services such as broadcasts, Contents on Demand (CoD) or games and reproduction information to the broadcast receiver.

A network system includes an Internet-based network and gateways. As the Internet-based network, various types of networks based on the IP, such as optical cable networks, coaxial cable networks, fiber-to-the-home (FTTH), telephone networks and wireless networks, may be used. The gateways may generally perform data delivery, multicast group management using a protocol such as an Internet Group Management Protocol (IGMP) and Quality of Service (QoS) management.

The IPTV indicates a broadcast receiver capable of receiving data transmitted via the Internet network and providing the data to a user. The broadcast receiver may include an IPTV settop, a homenet gateway and an IPTV embedded TV.

A hybrid IPTV system can provide various types of contents of the Internet as well as various types of existing broadcast contents. That is, besides various types of broadcast contents such as terrestrial broadcasting, cable broadcasting, satellite broadcasting or private broadcasting, various Internet image contents or data contents other than images can be provided to the user. These contents may be provided in real time or on demand.

FIG. 1 is a schematic view showing an IPTV system according to an embodiment of the present invention.

From the viewpoint of a content service provider, the IPTV system may be divided into a content provider (CP), a service provider (SP), a network provider (NP) and a user.

The CP manufactures and provides various types of contents. The CP may include a terrestrial broadcaster, a cable system operator (SO) or a cable multiple system operator (MSO), a satellite broadcaster and an Internet broadcaster.

The SP packages contents provided by the CP to a service and provides the service. For example, the SP of FIG. 1 packages a first terrestrial broadcast, a second terrestrial broadcast, a cable MSO broadcast, a satellite broadcast, various Internet broadcasts to the service and provides the service to the user.

As means for protecting the contents transmitted in the IPTV system, conditional access or content protection may be used. As an example of the conditional access or the content protection, a cable card or a downloadable conditional access system (DCAS) may be used.

The use of the security card or the DCAS is selected by the SP for providing the IPTV service. In the case where the security card or the DCAS is used in the broadcast receiver, the SP communicating with the broadcast receiver should use that system.

FIG. 2 is a schematic block diagram showing a broadcast receiver using the security card according to an embodiment of the present invention.

The broadcast receiver of FIG. 2 can receive all of an IPTV service based on the IP, a cable broadcast, a terrestrial broadcast and a satellite broadcast. The broadcast receiver of FIG. 2 may receive only the IPTV service or cable broadcasting according to the implementation examples. The security card of FIG. 2 may be called other terms according to the implementation examples.

The broadcast receiver shown in FIG. 2 mainly includes a host device and a security card. The host device includes a first broadband interface unit 202, a second broadband interface unit 204, a demodulator 206, a multiplexer 208, a demultiplexer 210, a decoder 212, an IP physical interface unit 214, a routing engine 216, an IP to transport packet decapsulator 218, a controller 222, a DCAS (Downloadable CAS) unit 224, a DVR (Digital Video Recorder) controller 226, a content encryption unit 228, a storage interface unit 230, a storage unit 232 and a card interface unit 234.

The security card 220 can include a single stream card capable of processing a single stream only or a multi-stream card capable of processing a plurality of streams simultaneously. And, the security card 220 can include the interface unit 236 and the controller 238. For instance, the security card 220 can be implemented with a cable card (CableCard) or a smart card.

The broadcast receiver corresponds to an open cable system in which a security card including a conditional access (CA) system is separated from a main frame. The security card may be called a POD (point of deployment) module and is detachably loaded in a main frame slot of the broadcast receiver. And, the main frame having the security card loaded therein may be called a host device. In particular, the broadcast receiver includes both of the security card and the host device.

The host shown in FIG. 2 exemplarily corresponds to a multi-stream host for processing a plurality of streams. In case of a single stream host for processing a single stream, the multiplexer 208 and the demultiplexer 210 make a CMP (cablecard MPEG packet) and the like by attaching a local header in order for the host shown in FIG. 2 to process a multi-stream and a process for multiplexing and demultiplexing them is bypassed. Yet, in case of the single stream host, other operations explained in the description of the present invention are performed in the same manner. A single stream card capable of processing a single stream only can be used as the security card 220. Alternatively, a multi-stream card capable of processing a plurality of streams simultaneously can be used as the security card 220.

A network connecting unit 200 plays a role in connecting an external network and a broadcast receiver to each other. For instance, the broadcast receiver can be connected to the external network using DOCSIS modem. Alternatively, the broadcast receiver can be connected to the external network using a wireless relay unit connected to a wireless internet network or a wireline relay unit connected to a wireline internet network such as a wireless ADSL relayer and the like. The examples for the connection with the external network are just exemplary. Which one of the examples will be used may depend on how it will be connected to the external network.

FIG. 3 is a configurational diagram of a broadcast receiver connected to an external network using DOCSIS modem according to the present invention.

Referring to FIG. 3, in case that the network connecting unit 200 is implemented with a DOCSIS modem, a broadcast receiver according to the present invention can interoperate with DOCSIS network. In particular, the network connecting unit 200 forms a DSG channel with a CMTS (DSG agent) relaying a data broadcast received from a set-top controller (DSG server) via DOCSIS network and is then able to receive broadcast data via the DSG tunnel. In this case, the DOCSIS network can be implemented with IP backbone network and is able to support IP multicast/unicast.

Yet, in order to support the IP multicast/unicast via the DOCSIS network, a packet received from the CMTS (DSG agent) should be transmitted by being converted to a DSG packet. Therefore, it is a problem that the broadcast receiver is unable to receive broadcast data by being directly connected to an external IP network.

In order to solve this problem, the network connecting unit 200 is able to provide a function for enabling the broadcast receiver to be directly connected to the external IP network.

For example, it is able to implement the network connecting unit 200 with MOCA (multimedia over coax alliance). In case of implementing the network connecting unit 200 with the MOCA (multimedia over coax alliance), an IP based network is established on a coaxial cable network and is then connectible. In particular, in case of implementing the network connecting unit 200 with the MOCA multimedia over coax alliance), DOCSIS network may not be used. It is unnecessary to use the DOSCIS modem. And, it is unnecessary to use the CMTS connected with the DOCSIS modem on a network. Moreover, it is unnecessary use the DSG tunnel formed between the DOCSIS modem and the CMTS. Thus, it is able to implement seamless IP based connectivity on a coaxial network. Therefore, the broadcast receiver according to the present invention uses IP over coax, thereby enabling a user to be provided with a fast and stable broadcast service.

The IP physical interface unit 214 receives an Ethernet frame packet, which is transmitted to a specific IP address, of a signal received through the network connecting unit 200 and then forwards the received packet to the routing engine 216. Alternatively, the IP physical interface unit 214 receives data (e.g., pay program request, state information of receiver, user input, etc.) according to bi-directional communication from the routing engine 216 and then transmits the received data to an external network through the network connecting unit 200. In this case, the specific IP address can be an IP address of the host device itself or an IP address of the security card.

In case of the broadcast receiver shown in FIG. 2, IP broadcast data according to an IP protocol, a VOD (video on demand) signal or an OOB (out of band) message signal can be received via the IP physical interface unit 214. In case of a conventional cable broadcast, such an OOB message as SI (system information), EAS (emergency alert system), XAIT (extended application information table), conditional access system information, various kinds of card control information and the like is received using DSG (DOCSIS settop gateway) or OOB (out of band) system.

In case of the broadcast receiver shown in FIG. 2, the OOB message can be received in a manner of providing DOCSIS modem, OOB tuner or the like within the host device. For instance, OOB message can be received using either IP system or OOB system. Alternatively, OOB message can be received using IP system, DSG system or OOB system.

In case of receiving OOB message using either IP system or OOB system, the broadcast receiver shown in FIG. 2 further needs an OOB tuner, a demodulator and the like. In case of receiving OOB message using IP system, DSG system or OOB system, the broadcast receiver shown in FIG. 2 further needs DOCSIS modem, OOB tuner, a switching unit for selecting the DSG system or the OOB system, a demodulator for transmitting data to a head end side according to the corresponding system, and the like.

Whether to use a case of using the IP system, the conventional DSG system or the OOB system or a case of using the IP or OOB system except the DSG system is decided by a transmitting side. And, a result of the decision is then transmitted to the security card 220. If so, it is able to solve the problem of backward capability as well.

The OOB message in the above description is just exemplary. According to implementations, other necessary information is added as well as the above exemplary information or unnecessary information can be removed from the above exemplary information.

The routing engine 216 routes each packet transmitted by the IP physical interface unit 214 to a destination of the corresponding packet. For instance, the routing engine 216 is able to route the packet to the destination using TCP/IP (transmission control protocol/internet protocol) based network stack and the like.

The routing engine 216 can support both of the TCP/IP and UDP/IP (user datagram protocol/internet protocol). And, the routing engine 216 is able to perform discrimination between in-band data and OOB data using packet header information, jitter filtering and the like.

FIG. 4 is a structural diagram of an Ethernet frame according to one embodiment of the present invention. The routing engine 216 receives an Ethernet frame having the structure shown in FIG. 4. The frame includes a 14-byte Ethernet header, a 20-byte IP header, an 8-byte UDP header, a payload, an Ethernet CRC (cyclic redundancy check) and the like. In case of transmitting data according to TCP instead of UDP, a TCP header is usable instead of the UDP header. And, a TCP payload can be received by being included in the data instead of the UDP payload. The payload can include in-band data, OOB data and the like.

The routing engine 216 performs routing by discriminating the data received in the format shown in FIG. 4 into in-band data and OOB data. In order to discriminate the in-band data and the OOB data from each other, header information by agreement between transmitting and receiving sides and the like is usable. Each of the discriminated in-band and OOB data can be routed to the data destination using a second, third or fourth layer.

In case of using the second layer routing, routing is performed using a MAC (media access control) address system of a destination contained in an Ethernet header of a received Ethernet frame.

In case of using the fourth layer routing, routing is performed using a port of a destination contained in a UDP header of a received Ethernet frame. If the Ethernet frame contains a TCP header, routing is performed using a TCP port of a destination.

Whether to use the second layer routing or the third layer routing may be changed according to an implementation example. In particular, according to the implementation example, the second, third or fourth layer routing system can be used.

For instance, in case of using the second layer routing, in the data used by the host device among the received data, MAC address information of the host device is contained in an Ethernet header. In case of using the third layer routing, in the data used by the host device among the received data, MAC address information of the host device is contained in an IP header. In case of using the fourth layer routing, in the data used by the host device among the received data, a port number is contained in a UDP or TCP header.

In-band data including audio, video and data broadcast data and the like in the data received by the routing engine 216 is routed to the IP to TS decapsulator 218. In the case, the in-band data can be an MPEG TS coded by MPEG coding or a stream coded by a different coding scheme.

The IP to TS decapsulator 218 parses the received MPEG (moving picture expert group) or MPEG-2 based TO packet and then outputs the parsed packet to the multiplexer 208. A process after the multiplexer 208 will be described later. In the above example, the MPEG=2 based broadcast data is assumed. So, the TP packet is received and then parsed. Yet, in case that broadcast data using a different specification is received, a unit different from a TP packet unit is usable. Therefore, the above idea of the present invention is not restricted by the terminology according to the implementation example.

The routing engine 216 transmits a packet, of which destination is the security card 220, to the security card 220. The OOB (out of band) message corresponding to one of the packets, of which destination is the security card 220, is routed by the routing engine 216 and is then transmitted to the security card 220. In case of routing the OOB message to the security card 220, it is able to transmit the data to the security card 220 by the second, third or fourth layer routing.

The first broadband interface unit 202 tunes to a specific channel frequency of a terrestrial A/V (audio/video) broadcast transmitted via antenna or a cable A/V broadcast transmitted by in-band through a cable connected to the network connecting unit 200 and then outputs the corresponding broadcast to the demodulator 206.

In this case, since the terrestrial broadcast and the cable broadcast differ from each other in transmission scheme, they differ from each other in a demodulation scheme by the demodulator 206. For instance, the terrestrial A/V broadcast is modulated by VSB (vestigial sideband modulation) scheme and is then transmitted. The cable A/V broadcast is modulated by QAM (quadrature amplitude modulation) scheme and is then transmitted.

Therefore, if the channel frequency tuned by the first broadband interface unit 202 corresponds to the terrestrial broadcast, the corresponding broadcast is demodulated by VSB in the demodulator 206. If the channel frequency tuned by the first broadband interface unit 202 corresponds to the cable broadcast, the corresponding broadcast is demodulated by QAM in the demodulator 206.

The second broadband interface unit 204 tunes to a specific channel frequency of a cable A/V broadcast transmitted by in-band through a cable connected to the network connecting unit 200 and then outputs the corresponding broadcast to the demodulator 206.

Each of the first and second broadband interface unit 202 and 204 tunes to a signal on a different channel and then transmits the tuned signal to the demodulator 206. Alternatively, a different A/V stream of the same channel of the first broadband interface unit 202 is tuned and then transmitted to the demodulator 206.

For instance, the first broadband interface unit 202 tunes a stream of a main picture and the second broadband interface unit 204 tunes a stream of PIP (picture in picture) In case of storing a digital video signal using DVR (digital video recorder) or the like, if both of the first and second broadcast interface units 202 and 204 are used, a video can be viewed while a video signal is stored.

The demodulator 206 demodulates the received signal and then transmits the demodulate signal to the multiplexer 208. The multiplexer 208 multiplexes the signal inputted by the demodulator 206 with the signal inputted by the IP to TP decapsulator 218 and then outputs the multiplexed signal. For instance, the main video tuned and demodulated by the first broadband interface unit 202 and the PIP video tuned and demodulated by the second broadband interface unit 204 are multiplexed together and then outputted. Alternatively, according to an implementation example, a video of a different channel can be multiplexed. Alternatively, it is multiplexed with the signal inputted by the IP to TP decapsulator 218 and is then outputted.

If the signal outputted by the multiplexer 208 is the terrestrial broadcast data, the inputted signal is outputted to the demultiplexer 210. If the signal outputted by the multiplexer 208 is the cable broadcast or IPTV broadcast data, it is outputted to the demultiplexer 210 via the security card 220 loaded in the slot. The security card 220 includes a conditional access 9CA) system for copy prevention and conditional access to a high value-added broadcast content and can be called a POD (point of deployment) module.

In particular, if the received broadcast data is scrambled, the security card 220 descrambles the scrambled data and then outputs the descrambled data to the demultiplexer 210. If the security card 220 is not loaded, the A/V broadcast data outputted by the multiplexer 208 is directly outputted to the demultiplexer 210. In this case, since it is unable to descramble the scrambled A/V broadcast data, it is unable to normally view the corresponding data.

According to an implementation example of the host device, IP packets containing A/V data of several channels can be simultaneously received. In particular, if the host device is implemented with a multi-stream host device for processing a plurality of streams, the host device can receive IP packets containing A/V data of several channels simultaneously.

In this case, the multiplexer 208 multiplexes the data contained in the IP packets of the different channels together by giving LTSID to each of the data. In this case, the LTSID is identification information used in identifying a corresponding stream data. For instance, if the multiplexer 208 receives the IP packet shown in FIG. 4, it is able to give LTSID mapped to each MPEG-TS using routing index information pre-agreed with a server transmitting data, a headend and the like.

The security card 220 discriminates is able to perform CA descrambling by discriminating data using the LTSID. And, the host can accurately route the data using the LTSID.

In this case, the routing index information can be received via such a network as Server and HeadEnd and the like. The routing index information can include an IP address list or a port list. And, the routing index information can include a list for IP address and ports relevant to the IP address. Moreover, the security card 220 should be able to support IP (internet protocol) card M-mode capable for processing IP packets containing A/V data of several channels simultaneously. For instance, the security card 220 supporting the IP (internet protocol) card M-mode can include an IP-M-card.

In case that the host device is a single stream host device for processing a single stream, the host device is able to receive an IP packet containing A/V data of a single channel. And, the security card 220 should be able to support IP (internet protocol) card S-mode capable of processing an IP packet containing A/V data of a single channel. For instance, the security card 220 supporting IP (internet protocol) card S-mode can include an IP-S-card. In some cases, IP-M-card can support IP (internet protocol) card S-mode.

The demultiplexer 210 separates the inputted video data and the inputted audio data from each other and then outputs the separated data to the decoder 212. The decoder 212 reconstructs the compresses A/V signal into an original signal through video decoding algorithm and audio decoding algorithm and then outputs the reconstructed signal to be displayed.

The DVR controller 226, the content encryption unit 228, the storage interface unit 230 and the storage unit 232 play roles in storing the received data or playing back the stored data.

The DVR controller 226 controls video data, which are selected from the data outputted from the demultiplexer 210, and the like to be stored or controls video data, which is selected from the stored data, to be played back, under the control of the controller 222.

The content encryption unit 228 encrypts data to be stored and then outputs the encrypted data. The content encryption unit 228 reconstructs the encrypted and stored data, and then outputs the reconstructed data. And, the encryption unit 228 may not be used according to an implementation example.

The storage interface unit 230 performs data input/output interfacing with the storage unit 232. And, the storage unit 232 stores the inputted data therein.

The DCAS unit 224 downloads a conditional access system (CAS) from a transmitting side server and then stores the downloaded data therein. The DCAS unit 224 performs a conditional access function according to an appropriate conditional access system among the stored conditional access systems.

And, the controller 222 controls an interface between the host device and the security card, data processing of the host device and the like.

FIG. 5A and FIG. 5B are tables for operating modes mapped according to a combination between security CARD and host device, respectively.

Referring to FIG. 5A and FIG. 5B, security cards can be discriminated into S-card, M-card, IP-S-card and IP-M-card. And, host devices can be discriminated into a single stream host, a multi-stream host, a single stream IP card host and a multi-stream IP card host. In case that a security card is provided to a host device, the host recognizes a mode of the security card, determines the recognized mode and then identifies a corresponding operation mode. In this case, the operation mode can be classified into S-mode, M-mode, IP card S-mode and IP card M-mode.

If a host device is a single stream host and if a security card is S-card, an operation mode can become an S-mode. If a host device is a single stream host and if a security card is M-card, an operation mode can become an S-mode. If a host device is a multi-stream host and if a security card is M-card, an operation mode can become an M-mode.

If a host device is a single stream IP card host and if a security card is IP-S-card, an operation mode can become an IP card S-mode. If a host device is a single stream IP card host and if a security card is IP-M-card, an operation mode can become an IP card S-mode. If a host device is a multi-stream IP card host and if a security card is IP-M-card, an operation mode can become an IP card M-mode.

FIG. 6A and FIG. 6B are tables for card interface pin assignment of cards using PC card form, respectively.

Referring to FIG. 6A and FIG. 6B, S-mode of a conventional cable card follows the pin configuration shown in the table shown in FIG. 6. CD1#, CD2#, VS1#, VS2#, VPP1 and VPP2 are assignment of specific pins of a conventional cable card. And, CD1#, CD2#, VS1#, VS2#, VPP1 and VPP2 can becomes assignment of specific pins in IP card S-mode and IP-card M-mode of a security card. In particular, the interface unit 234 of the security card can include CD1#, CD2#, VS1#, VS2#, VPP1 and VPP2 pins.

FIG. 7 is a diagram of an interface between a host device and a security CARD.

Referring to FIG. 7, the card interface unit 234 can include CD1#, CD2#, VS1#, VS2#, VPP1, VPP2, VCC and IPDET ports. Correspondingly, the interface unit 236 of the security card can include CD1#, CD2#, VS1#, VS2#, VPP1, VPP2, VCC and IPDET pins.

If the security card is IP-M-card, the interface unit 236 of the security card can be implemented in a manner that the IPDET pin is connected to the VS1# pin.

If the security card is implemented in a manner that the IPDET pin is connected to the VS1# pin, the controller 222 controls a mode confirmation signal to be outputted to the POD through the IPDET port, the outputted mode confirmation signal is inputted to the VS1# port. In particular, if the security card is loaded in the host device, the controller 222 controls the mode confirmation signal to be outputted to the POD via the IPDET port. If the outputted mode confirmation signal is inputted to the VS1# port, it is able to confirm that the security card is an IP-M-card and it is able to identify that an operation mode is an IP (internet protocol) card M-mode.

If the security card is an M-card, the interface unit 236 of the security card can be implemented in a manner that the IPDET pin is connected with the VS2# pin. In particular, the card interface unit 234 can be provided with the IPDET port to check the IP-M-card and the M-card.

If the security card is implemented in a manner that the IPDET pin is connected to the VS2# pin, the controller 222 controls a mode confirmation signal to be outputted to the POD through the IPDET port, the outputted mode confirmation signal is inputted to the VS2# port. In particular, if the security card is loaded in the host device, the controller 222 controls the mode confirmation signal to be outputted to the POD via the IPDET port. If the outputted mode confirmation signal is inputted to the VS2# port, it is able to confirm that the security card is an M-card and it is able to identify that an operation mode is an M-mode.

The controller 222 is able to toggle the IPDET port to output the mode confirmation signal to the IPDET port. In particular, after the IPDET port has been toggled and if the VS1# port is toggled, the controller 222 is able to confirm that the loaded security card is an IP-M-card.

FIG. 8 is a table for a signal supplied to a security card to inform the security card of an operation mode identified by a host device.

Referring to FIG. 8, in case of identifying an operation mode as an IP card M-mode, the controller 222 sets the VPP1 port and the VPP2 port to ‘logic low’ and ‘logic low’, respectively. In case of identifying an operation mode as an M-mode, the controller 222 sets the VPP1 port and the VPP2 port to ‘logic low’ and ‘logic high’, respectively. And, in case of identifying an operation mode as an S-mode, the controller 222 sets the VPP1 port and the VPP2 port to ‘logic high’ and ‘logic high’, respectively.

By detecting states of the CD#1 and CD#2 ports, the controller 222 is able to check whether the POD is inserted or not. In particular, if both of the ports of the CD#1 and CD#2 are set to ‘low’, the controller 222 recognizes that the security card is inserted. The reason is explained as follows. First of all, in case that the security card is inserted in the host device, the CD#1 and CD#2 pins maintain the ‘low’ state. If the VS#1 is not set to ‘logic low’, the controller 222 recognizes that an unsuitable card is inserted and is then able to stop an operation of identifying the security card.

After having confirmed the insertion of the security card, if the VS1# is set to ‘low’, the controller, 222 controls a mode confirmation signal to be outputted to an IPDET port in order to check whether the security card is an IP-M-card or an M-card. In this case, after the mode confirmation signal has been outputted to the IPDET port, if the mode confirmation signal is not inputted to the VS#1 or VS#2 port connected to the IPDET, the controller 222 is able perform an operation to check whether the security card is an S-card.

In order to check whether the security card is the S-card, the controller 222 parses CIS (card information structure information) of the inserted security card using a personality change sequence. In this case, if the parsed CIS information corresponds to ‘OPENCABLE_POD_MODULE’, the controller 222 checks that the security card is the S-card and identifies that an operation mode is an S-mode. The controller 222 then sets both of the VPP1 and VPP2 ports to ‘logic high’.

The controller 238 of the security card checks an operation mode by detecting the states of the VPP1 and VPP2 pins and then performs self-initialization according to the checked operation mode. In particular, if the VPP1 pin and the VPP2 pin are set to ‘logic low’ and ‘logic low’, respectively, the controller 238 of the security card decides that the host device supports IP (internet protocol) card M-mode. The controller 238 then performs self-initialization according to the IP (internet protocol) card M-mode. If the VPP1 pin and the VPP2 pin are set to ‘logic low’ and ‘logic high’, respectively, the controller 238 of the security card decides that the host device supports an M-mode. The controller 238 then performs self-initialization according to the M-mode. If the VPP1 pin and the VPP2 pin are set to ‘logic high’ and ‘logic high’, respectively, the controller 238 of the security card decides that the host device supports an S-mode. The controller 238 then performs self-initialization according to the S-mode.

FIG. 9 is a diagram for performing a method of identifying an operation mode according to one preferred embodiment of the present invention.

Referring to FIG. 9, the controller 222 checks whether a security card is inserted or not by checking states of CD#1 and CD#2 ports [S900]. In this case, if both of the CD#1 and CD#2 ports are set to ‘low’, the controller 222 can confirm that the security card is inserted.

The controller 222 outputs a mode confirmation signal to the security card via IPDET port [S905]. The controller 222 then checks whether the outputted mode confirmation signal is inputted to the VS1# port [S910]. In this case, if the security card is an IP-M-card, it is assumed that the interface unit 236 implements a signal inputted to an IPDET pin to be outputted to the VS1# pin.

If the mode confirmation signal outputted via the IPDET port is not inputted to the VS1# port and if the VS#1 port fails to keep the state of ‘low’ but is in a state different from ‘low’, the controller 222 confirms that an unsuitable card is inserted. The controller 222 then stops the operation mode identification [S915].

If the mode confirmation signal outputted via the IPDET port is inputted to the VS1# port, the controller 222 checks whether the VS2# is set to ‘low’. If the VS2# is not set to ‘low’, the controller 222 confirms that an unsuitable card is inserted by performing the step S915 and then stops the operation mode identification.

If the VS2# is set to ‘low’, the controller 222 sets the VPP1 port and the VPP2 port to ‘logic low’ and ‘logic low’, respectively [S925].

If so, the controller 238 of the security card confirms that the VPP1 port and the VPP2 port are set to ‘logic low’ and ‘logic low’, respectively. The controller 238 of the security card then performs self-initialization according to an IP CARD S-Mode [S930].

If the mode confirmation signal outputted via the IPDET port is not inputted to the VS1# port and if the VS#1 port still keeps the state of ‘low’, the controller 222 checks whether the outputted mode confirmation signal is inputted to the VS2# port [S935]. In this case, if the security card is the M-card, it is assumed that interface unit 236 implements a signal inputted to an IPDET pin to be outputted to the VS2# pin.

If it is not confirmed that the outputted mode confirmation signal is inputted to the VS2# port, the controller 222 parses CIS (card information structure) information of the inserted security card using a personality change sequence [S940]. The controller 222 then confirms whether the parsed CIS information is ‘OPENCABLE_POD_MODULE’ [S945].

If the parsed CIS information is not ‘OPENCABLE_POD_MODULE’, the controller 222 performs the step S915 and confirms that an unsuitable card is inserted. The controller 222 then stops operation mode identification.

If the parsed CIS information is ‘OPENCABLE_POD_MODULE’, the controller 222 sets the VPP1 port and the VPP2 port to ‘logic high’ and ‘logic high’, respectively [S950]. If so, the controller 238 of the security card confirms that the VPP1 pin and the VPP2 pin are set to ‘logic high’ and ‘logic high’, respectively. The controller 238 of the security card then performs self-initialization according to an S-mode [S955].

If the outputted mode confirmation signal is inputted to the VS2# port, the controller 222 sets the VPP1 port and the VPP2 port to ‘logic low’ and ‘logic high’, respectively [S960].

If so, the controller 238 of the security card confirms that the VPP1 pin and the VPP2 pin are set to ‘logic low’ and ‘logic high’, respectively. The controller 238 of the security card then performs self-initialization according to an M-mode [S965].

FIG. 10 is a diagram for performing a method of identifying an operation mode according to another preferred embodiment of the present invention.

Referring to FIG. 10, the controller 222 checks whether a security card is inserted or not by checking states of CD#1 and CD#2 ports [S1000]. In this case, if both of the CD#1 and CD#2 ports are set to ‘low’, the controller 222 can confirm that the security card is inserted.

If the security card is inserted, the controller 222 checks whether VS1# is set to ‘low’ [S1005]. If the VS1# is not set to ‘low’, the controller 222 confirms that an unsuitable card is inserted and then stops operation mode identification [S1010].

The controller 222 outputs a mode confirmation signal to the security card via IPDET port [S1015]. The controller 222 then checks whether the outputted mode confirmation signal is inputted to the VS2# port [1020]. In this case, if the security card is an M-card, it is assumed that the interface unit 236 implements a signal inputted to an IPDET pin to be outputted to the VS2# pin.

If the outputted mode confirmation signal is inputted to the VS2# port, the controller 222 sets VPP1 and VPP2 ports to ‘logic low’ and ‘logic high’, respectively [S1025].

If so, the controller 238 of the security card checks that the VPP1 pin and the VPP2 pin are set to ‘logic low’ and ‘logic high’, respectively and then performs self-initialization according to an M-mode [S1030].

If the VS2# port maintains the low state, the controller 222 checks whether the outputted mode confirmation signal is inputted to the VS1# port [S1035]. In this case, if the security card is an IP-M-card, it is assumed that the interface unit 236 implements a signal inputted to an IPDET pint to be outputted to the VS1# pin.

If the outputted mode confirmation signal is not inputted to the VS1# port and if the VS#1 port fails to keep the state of ‘low’ but is in a state different from ‘low’, the controller 222 performs the step S1010 and confirms that an unsuitable card is inserted. The controller 222 then stops the operation mode identification.

If it is not confirmed whether the outputted mode confirmation signal outputted is inputted to the VS1# port and if the VS#1 port still keeps the state of ‘low’, the controller 222 parses CIS (card information structure) information of the inserted security card using a personality change sequence [S1040]. The controller 222 then checks whether the parsed CIS information is ‘OPENCABLE_POD_MODULE’ [S1045].

If the parsed CIS information is not ‘OPENCABLE_POD_MODULE’, the controller 222 performs the step S1010 and confirms that an unsuitable card is inserted. The controller 222 then stops operation mode identification.

If the parsed CIS information is ‘OPENCABLE_POD_MODULE’, the controller 222 sets the VPP1 port and the VPP2 port to ‘logic high’ and ‘logic high’, respectively [S1050]. If so, the controller 238 of the security card confirms that the VPP1 pin and the VPP2 pin are set to ‘logic high’ and ‘logic high’, respectively. The controller 238 of the security card then performs self-initialization according to an S-mode [S1055].

If the outputted mode confirmation signal is inputted to the VS1# port, the controller 222 sets the VPP1 port and the VPP2 port to ‘logic low’ and ‘logic low’, respectively [S1060]. In this case, if the security card is an IP-M card, it is assumed that the interface unit 236 implements a signal inputted to an IPDET pin to be outputted to the VS1# pin.

If so, the controller 238 of the security card confirms that the VPP1 pin and the VPP2 pin are set to ‘logic low’ and ‘logic low’, respectively. The controller 238 of the security card then performs self-initialization according to an IP-M-mode [S1065].

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. 

1. A host device, which interfaces with a POD (point of deployment), the host device comprising: an interface unit including CD#1, CD#2, VS1#, VS2#, VPP1, VPP2 and IPDET ports; and a controller controlling a mode confirmation signal to be outputted to the POD via the IPDET port, and recognizing that the POD supports an IP (internet protocol) card M-mode if the outputted mode confirmation signal is inputted to the VS1# port.
 2. The host device of claim 1, wherein if recognizing that the POD supports the IP card M-mode, the controller sets the VPP1 port and the VPP2 port to ‘logic low’ and ‘logic low’, respectively.
 3. The host device of claim 1, wherein the controller checks whether the POD is inserted by detecting states of the CD1# and CD#2 ports.
 4. The host device of claim 1, wherein after checking that the POD is inserted, the controller controls the mode confirmation signal to be outputted.
 5. The host device of claim 1, wherein the controller controls the mode confirmation signal to be outputted by toggling the IPDET port.
 6. A POD (point of deployment), which interfaces with a host device, the POD comprising: an interface unit including CD#1, CD#2, VS1#, VS2#, VPP1, VPP2 and IPDET pins, and enabling a signal inputted via the IPDET pin to be outputted to the VS1# pin; and a controller checking whether the host device supports an IP (internet protocol) card M-mode by detecting states of the VPP1 and VPP2 pins, and performing initialization according to whether the host device supports the IP (internet protocol) card M-mode.
 7. The POD (point of deployment) of claim 6, wherein if the VPP1 pin and the VPP2 pin are set to ‘logic low’ and ‘logic low’, respectively, the controller confirms that the host device supports the IP (internet protocol) card M-mode.
 8. The POD (point of deployment) of claim 6, wherein if the POD is inserted in the host device, both of the CD1# and CD2# pins are in low states, respectively.
 9. A method of identifying an operation mode, comprising the steps of: checking whether a POD (point of deployment) is inserted; outputting a mode confirmation signal to the POD via an IPDET port when the POD (point of deployment) is inserted; checking whether the outputted mode confirmation signal is inputted to either a VS1# port or a VS2# port; and recognizing that the POD supports an IP (internet protocol) card M-mode when the outputted mode confirmation signal is inputted to the VS1# port.
 10. The method of claim 9, wherein further comprises setting a VPP1 port and a VPP2 port to ‘logic low’ and ‘logic low’, respectively when the POD is recognized as supporting the IP card M-mode.
 11. The method of claim 9, wherein in the POD insertion checking step, whether the POD (point of deployment) is inserted is checked by detecting states of CD1# and CD2# ports.
 12. The method of claim 9, wherein in the mode confirmation signal outputting step, the mode confirmation signal is outputted by toggling the IPDET port. 